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2 3 Cone Penetration Testing and Discrete Groundwater Sampling <br /> ' On April 25, 2000, to evaluate the vertical extent of impacted sod and groundwater, Gregg Drilling <br /> and Testing, Inc (Gregg), a state licensed drilling contractor (C-57#656407), advanced one on- <br /> site cone penetration test (CPT) boring and collected discrete soil and groundwater samples at <br /> one on-site location <br />' Sod samples were collected into stainless steel sample sleeves with a push-driven soil sampler at <br /> 65, 70 and 74 feet bgs All three sod samples contained relatively low concentrations of at least <br />' one compound analyzed The sample collected at 65 feet contained 10 mg/kg of TPH-as- <br /> gasoline, 0 15 mg/kg of benzene, 0 14 mg/kg of toluene, 0 26 mg/kg of ethylbenzene, and 0 73 <br />' mg/kg of xylenes The sample collected at 70 feet only contained 0 0071 mg/kg of toluene, and <br /> i <br /> the sample collected from 74 feet only contained 0 02 mg/kg of toluene, 0 0068 mg/kg of <br /> ethylbenzene and 0 05 mg/kg of xylenes The five oxygenate compounds, 1,2-dichloroethane <br />' (1,2-DCA) and EDB were not detected in any of the three soil sample analyses <br /> Based on the CPT and pore pressure dissipation data, groundwater-bearing sand and gravel <br /> sequences were identified beneath the groundwater table at approximately 60 and 105 feet bgs <br /> Gregg discretely sampled the groundwater interval at 60 feet bgs using a SimulProbe The <br /> groundwater sample collected at 60 feet bgs contained 5,700 µg11 of TPH-as-gasoline, 76 pg/I of <br /> benzene, 61 pg/I of toluene, 53 Agll of ethylbenzene, 280 pg/I of xylenes, and 11 µg11 of 1,2-DCA <br /> The five oxygenate compounds and EDB were not detected in the groundwater sample <br /> 1 <br /> 1 <br /> 7 <br /> 1 <br />